8 + 9, 7 + 5, 11 - 6, 10 - 9, 7 + 4, 8 + 3, 12 - 3, 12 - 6, 9 + 5, 7 + 7, 14 - 8, 11 - 9, 8 + 8, 7 + 4, 12 - 4, 13 - 4, 14 - 5, 15 - 6, 16 - 7, 9 + 9, 7 + 8, 17 - 9, 6 + 6, 20 - 11, 20 - 14, 12 + 8, 14 + 6.

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